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If you have any information about this feature which does not appear on the extract below, please contact the Geographical Names Board's Secretariat with your comments and suggestions.

19th April 2019
Reference:   41988
Placename:   Nepean River
Designation:   River
Status:   Assigned 19th October 1973
Previous Names:   Cowpasture River
Mittagong River
London River.
LGA:   Penrith
Approx. AGD66 Lat:   -33 43 58
Approx. AGD66 Long:   150 39 28
Approx. GDA94 Lat:   -33 43 52
Approx. GDA94 Long:   150 39 32
Topographic Map:   Springwood
1:100000 Map:   Penrith 9030
Parish:   Castlereagh
County:   Cumberland
Description:   A perennial stream rising on the eastern end of the Mittagong Range about 21/2 km N of Robertson. It flows generally north in a meandering course for about 145 km to its junction with the Grose River to become the Hawkesbury River. Some of its principal tributaries are the Bargo, Warragamba, Cordeaux and Cataract Rivers.
Origin:   Named by Governor Arthur Phillip in 1789 in honour of Evan Nepean, then the Under-Secretary of State for the Home Department.(Nepean had a major hand in organinsing the First Fleet and the administration system for the new colony of NSW). (Appleton; 1992)
History:   Aboriginal name Yandhai. (McCarthy; 1963).
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